In a Nutshell

The Fine Print

Promotional value expires Jul 15, 2012. Amount paid never expires.Limit 2 per person, may buy multiple as gifts. Valid only for option purchased. Must be 10 or older for 5K, max age 102. Online registration required by midnight on 7/7/12.Merchant is solely responsible to purchasers for the care and quality of the advertised goods and services.

RunnerCross

Thomas Edison declared that genius is 1% inspiration and 99% perspiration, a fact he discovered while inventing the volcano. Work up a healthy sweat with this Groupon.

Choose Between Two Options

$20 for entry for one person to the individual 5K mud run (up to a $47 value)

$20 for entry for one person to the three-person 15K relay mud run (up to a $45 value)

The event takes place on July 14 at Throttle 215 MX Park. Individual 5K heats of 300 runners each leave every 30 minutes starting at 9:00 a.m. The 15K relay heats start at 11:00 a.m. Participants may pick up their race packets on the day of the event at least one hour before their scheduled race time.

Entry fees increase by $5 every two weeks until the day of the event.

Though RunnerCross sometimes features a discounted price online, this Groupon still offers the best deal available.

RunnerCross

Equal parts footrace, obstacle course, and mud bath, each RunnerCross course pits participants against up to 15 kilometers of creative and slippery barriers. Runnable as an individual race or as a team relay, heats of 300 runners at a time quickly muddy themselves as they scramble over hay bales, scale rain-slicked hills, and traverse bogs atop a teetering rope bridge. ChronoTrack timing chips in the numbered bibs give runners accurate lap times for settling photo finishes or stacking against past 5Ks, such as George Washington's historic run from a mob of angry cherry farmers.